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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19aa121c8b6c81f9e632ae6028155a41b75f416794336cc99cb802479e9069ec' 
  AND token = '+DUscsrIT3KTfgBkXtHr1h79G+ez3NZKSAnL8MQvm+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}